Answer:
You need to isolate X on one side.
Step 1: subtract 6 in order to move it to the other side and isolate x:
-x+ 6 = 7
-6 -6
-x = 7 - 6
Step 2: simplify.
-x = 7-6
-x = 1
Step 3: divide both sides to make x positive.
-x/-1 = 1/-1
x = -1
(aka make x positive and everything else negative
the answer is x = - 1